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Promethium
Promethium

Terbium
Terbium



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Promethium
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Terbium

Physical Properties of Promethium and Terbium

Physical

Melting Point

1,042.00 °C1,356.00 °C
-38.83 3410
👆🏻

Boiling Point

3,000.00 °C3,123.00 °C
0 5660
👆🏻

Appearance

Physical State

Solid
Solid

Color

-
Silvery White

Luster

Metallic
Metallic

Hardness

Mohs Hardness

-1.50
0.2 8.5
👆🏻

Brinell Hardness

400.00 MPa677.00 MPa
0.14 3490
👆🏻

Vickers Hardness

600.00 MPa863.00 MPa
0 3920
👆🏻

Speed of Sound

2,260.00 m/s2,620.00 m/s
818 16200
👆🏻

Optical Properties

Refractive Index

1.701.60
0.155 3.41
👆🏻

Reflectivity

63.00 %35.00 %
5 97
👆🏻

Allotropes

α Allotropes

-
-

β Allotropes

-
-

γ Allotropes

-
-